pjax submit with codeigniter/php

gistfile1.php

<?php

class Account extends CI_Controller {
....


function login(){		
  if($_POST){
	$status=$this->account_model->check_login();
        if($status){
   	   $this->output->set_header('X-PJAX-URL: http://localhost/library');
	   $this->output->set_header('Location: ' . site_url('library'), false);
	   //redirect('library');          
        }	
  }
}